tty.c

   1 /* `tty.c` - return user's terminal name
   2    Copyright (c) 2022, Alan Potteiger
   3    See `LICENSE` for copyright and license details */
   4
   5 #define _POSIX_C_SOURCE 200809L
   6
   7 #include <stdio.h>
   8 #include <unistd.h>
   9
  10 static const char *usage = {
  11         "tty\n"
  12 };
  13
  14 int
  15 main(int argc, char *argv[])
  16 {
  17         char *name;
  18
  19         if (isatty(0) && (name = ttyname(0)) != NULL) {
  20                 puts(name);
  21                 return 0;
  22         }
  23
  24         puts("not a tty");
  25         return 1;
  26 }
  27